Wide angle imaging lens group for endoscope
The utility model provides a wide angle imaging lens group for endoscope is along optical axis accessory things side to including first lens, aperture stop, second lens, third lens, infrared ray filtering filter element and imaging surface in proper order for instance incline. Wherein first lens hav...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The utility model provides a wide angle imaging lens group for endoscope is along optical axis accessory things side to including first lens, aperture stop, second lens, third lens, infrared ray filtering filter element and imaging surface in proper order for instance incline. Wherein first lens have a negative refracting power, and its thing side is the concave surface in that the paraxial is regional, are the concave surface like the side, the second lens have positive refracting power, and its thing side is the convex surface, the third lens have positive refracting power, and its thing side is at the regional convex surface that is of paraxial, like the side at the regional concave surface that is of paraxial, wherein, an aperture stop arranges first lens in like between side and the second lens thing side. The wide angle imaging camera lens of this structure satisfies following relational expression simultaneously: 23.286<, F1f<, 2.105 wherein, f1 is the effective focal length of first lens, and f is |
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